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How do I add text boxes to my program? I found out about controlP5 from google but does it work with version 3.2.1?
What do you mean by "text boxes"?
Do you mean some text displayed inside a rectangle?
Or do you mean an interface element, like a web form, which allows click inside with the mouse and type?
The more details you offer about what you are accomplish the easier it is for forum members to suggest solutions.
Maybe you need to install the newer version from Github? This next post could be relevant to your question:
If you are creating a Java desktop application then G4P has text boxes for keyboard input. It also has a visual tool to help create the GUI, GUI Builder both installable through Processing. It also has a helpful website